How about stapling the Darco to the underside at 6-8" spacing to give it strength to hold the weight of the undercoating? This assumes the undercoating will seal the staple punctures from water. Or one better, use the Darco seam tape to seal the staples then apply undercoating.
I have thought about thin ABS sheeting as well for sealing the Darco.
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2013 Premier 22RBPR
2022 GMC 2500HD 4x4 Gasser
2019 Beta 500 RR-s (Pasta Rocket!)
2015 Honda CRF250L (Wifes)
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